MBP trouble

After some little problems with my MacBook Pro (like noise from hd and a terrible hot) yesterday and today I have some strange network shutdown, when it happends I can see

AppleYukon: error - Uncorrectable PCI Express error

in the console; the only thing that I can do is to restart the notebook, I’ve tried to restart only the services, but without success.
Looking on the net I’ve not found anything and I don’t know if it is a software or hardware problem.